Press



June 15, 1948. J. w. BRUNDAGE PRESS 4 Sheets-Sheet 1 Filed NOV. 14, 1945 JNVENTOR. JAMES W. BRUNDAGE. 2%

June 15, 1948. J. w. BRUNDAGE PRESS 4 Sheets-Sheet 2 Filed Nov. 14, 1945 INVENTOR. JAM ES W. BRU N DAGE.

June 15, 1948. J. w. BRUNDAGE PRESS 4 Sheets-Sheet 3 Filed NOV. 14, 1945 INVENTOR. JAMES W. BRUNDAGE.

June 15, 1948. R NDA I 2,443,573

PRESS Filed Nov 14, 1945 4 Sheets-Sheet 4 INVENTOR. JAMES W. BRUN DAGE.

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Patented June 15, 1948 UN I TE D S ENT OF Fl CE PRESS James Vt; Brundage; Akron; Ohio; assign'or to lhe Akron Standard- Mold Company Akron; Ohio; a corporation of ohio 1 Application November 14, 1945; Serial I-To'."628;588'

( (liais -17) S Claims.

'1 Thisinvention relates to molding and vulcanizing pressesfor mechanical rubbergoods and particularly to those wherein the mating moldsections are relatively movable, one of 'thesections being. tiltable with reference to theother'soas to facilitate the insertion and withdrawal, by'an operator, of an article to he operated upon by the press.

In the manufacture of mechanical rubber goods, itis desirable that thematingmold sections move inarectilinear path during the final closing mothe mold sections be arranged to swingv ortilt after they have been opened to a predetermined extent so as to make it convenient for the operator :to remove the finished articles and .to insert a fresh supply within the mold-sections.-

The problem.;presented,i therefore, was to so .mount the movable mold :member that itwould tiltiaway fromthefi-xed'member when fully open, 30

and, when closing, would'tiltbackinto parallelism with Hand thenceforthmove normalto the parallel faces until the moldwas fully closed. The object ofcthe present invention is to provide in simple and rugged :form .asupportinglinkage 35 which will control the path ofmovement in the manner just.stated.-

.A, press made according to the present invention is designed to .obtain the desired order of swinging. and rectilinear movement of the mov- -able..mold section during the closing movement of .thepress and is also designed to maintain] a, constant application vof closing pressure against the movable mold section until the completion of theuvulcanizin'g operation. The final closing It is additionally desirable inpresses for makingmechanical rubber goods that movementis accomplished Jjust'before therpower actuated toggle mechanism reaches a dead center position, and inthis way a constant pressure is .maintained .by the .source of power against the center position, it is possible to obtain a large sealing vpressure which is necessary to assure a 2. flow of "the rubber into all parts'ofthe mold during the vulcanizi'ng operation. The present invention-provides a system of linkage by means of which the'desired' movement of a'mold section may be obtained. The mechanismis soarranged that th'e'hinged end of themovablemold section remains substantially stationary whenever the mold sections "areheld apart 'sufiiciently to avoid interference therebetween, whereby the 'movable section is caused to -travel in a' curved "path and to'ltilt' 'awayjfrom' the'fixed section. Upon close approach,hjowever,' of the mold sectionsthe hinge pin isQcau'sed to travel parallel to anda't an equal speed with the moving mold section, and thus to cause it to more in a rectilinear path normal to the meeting .faces of themold members.

Referring. nowto the drawings,' Fig.' 1 is a side elevation of asimplified showing of a, press vembodying my invention, part of a, side wallfbeing broken awaymore clearlyto illustrate the parts therebehind; FigiZis a fragmentary cross section takenz'on --thel-ine- 2--2 of Fig; 1; Figs. 3 and 4 are views similar *to that of Fig, 1 but showing zthepartsin zdifferent relative positions; and'Fi g. 5 is a frontelevationvof the press.

Intthe' -:,drawings, 9, main frame is shown-for the ;press which comprises a base 10 and side members .1;! which maybe-=bracedby a cross member 12 The upper :mold member t3 -is--securedtothe side z'plates at 14in arrinclinedposi- :tion to-Lpresent a imin'imumiof interference with the operator.-

The' lower: mold .member :15 is rigidly. secured to a movable press head 6 which, in turn; is supported by'a hinge pin :tl slidably journaled in the side plates :and .by a suitable ;supp'ortingand actuating-mechanism; suchiasvthe toggle shown as comprising a pair of arms il tand'a link-l9. =-The= hinge piniis.carriedsbyrearwardly extending brackets 23 on the" press: head and :may take the form of arodor shaft extending across-the press and through appropriate clearance openings :2! in the sidefplates'. :The' shaft may :be provided with 'anti friction rollers=22 :at each-end; An inclined traekway is provided;- as b the Wear plates 23, at eachsideof the-presswhereby-the hinge pin maytrave'l upanddown but is constrained-to'do'so-ima-path normal to the plane "oftheparting face tit-the upper mold'm'embe'r, that is; parallel to the "axis of the -fiz'ie'dmold,

andof the movable mold-when closed.

The toggle arms 18 are journal'ed as at 24 near thetop ortheside' plates ll, and- =areforcibly driven forwardly 'and backpasby l'nfd'raulic piston 25, the cylinder 2'6 of which is journaled in the side plates at 27. Driving connection is made by means of a cross head 28 on the piston rod which is journaled in the lower ends of the arms 58. One end of the link 19 is pivoted to the arms 53 near their lower ends at 29, and the other end of the link pivotally supports the movable mold as by means of a cross shaft 30 passing through depending brackets 3| on the press head.

The movement of the operating mechanism for the movable mold controls the position of the hinge pin ll, most conveniently through the intermediacy of an appropriate cam arrangement. To this end, a cam plate 32 may be pivoted to each of the side plates H, at 33, and linked to the respective arm it of the toggle here employed, as by link members a l. A camming action is obtained between the cam plate and the hinge pin ll, this action being conveniently obtained by means of cam slots 35 in the plates through which the rollers 22 may project. The position of the rollers and of the hinge pin, along the path of travel as defined by the wear plates 23, is thus determined by the cam slot, and by a proper configuration of the slot the location of the hinge pin may be predetermined for each successive position of the arms I8. I have found that the desired operation of the press may be secured by having the hinge pin substantially stationary while the press heads are remote from each other. I obtain this result by providing a dwell by means of a substantially concentric portion .of the cam slot at 36. Upon near approach of the mold members, the hinge pin rises at the same rate as the movable mold member, and, to cause it so to rise, I provide the cam slot with an inclined or eccentric portion 31 merging with the concentric portion at 38.

In a cycle of operation of the press, Fig. 1 illustrates the initial relative positions in which the lower mold member is at its lowest position and tilted forwardly for convenient access on the part of the operator. The first phase of the closing movement takes place between the positions of Fig. 1 and Fig. 3. During this phase the hydraulic piston forces the toggle arms l8 forwardly, causing the links Hi to raise the mold member, swinging it about the pivot pin ll. As the arms i8 move forwardly they rock the cam plates 32 to the position shown in Fig. 3, but, because of the dwell in the cam slot, the pivot pin remains substantially unmoved, and the mold member describes a substantially circular arc thereabout. At the end of the first phase, the lower mold member, as seen in Fig. 3, is axially aligned with the upper mold member and parallel thereto, but separated from it by a substantial amount.

In the second phase of the closing movement, the toggle arms is continue to swing forward under the action of the piston, and the link [9 raises the lower mold and forces it toward the upper. As shown in Fig. 4, the press is so designed that when the mold sections are forced together the toggle elements have not been moved into dead center position. The rocking of the cam plate 32 during the second phase of the operation causes the inclined portion 3'! of the cam to engage the rollers 22. The hinge pin I1 is thus oammed upwardly in the trackway 23, the configuration of the cam being so correlated with the various lever arms and relative angles of the parts that the hinge pin rises in pace, or at the same speed as the movable mold member. The latter is thus maintained in axial alignment with the fixed member and approaches and meets it in parallelism.

In the opening of the press, the foregoing movements are reversed, axial and parallel alignment of the mold members being preserved until a substantial separation is had, and thenceforth the lower mold member is swung down and away from the upper to present its interior again to the operator.

It will be apparent that the press and operating mechanism therefor, here illustrated as an embodiment of my invention, are merely illustrative as numerous modifications may be made within the spirit and scope of my invention.

I claim:

1. A molding press comprising coacting press heads, one of which is movable with respect to the other, a frame carrying one of the heads, an arm pivoted to the frame, means for swinging the arm, a second arm pivoted to the first arm and to the movable head respectively, a cam pivotally mounted .on the frame and having a slot therein, said frame having a guideway crossin said slot, a member attached to the movable press head and acted upon conjointly by the slot and guideway, whereby a shiftable hinge is provided for the movable head, and a link connecting the first-named arm to the movable cam.

2. A molding press having a relatively fixed upper press head, and a relatively movable lower press head, a frame carrying the upper head, a toggle arm pivoted to the frame adjacent the upper portion thereof, means acting upon the lower portion of the arm to swing it with respect to the frame, a link connecting the lower portion of said arm to the movable press head, said frame having a slot therein, a cam pivoted intermediate its ends to the frame and having a slot therein adapted to register in crossing relationship with the slot in the frame, a pin carried by the movable press head and extending through both of said slots and acted upon by each to provide a shiftable hinge pivot for the movable head, and means connecting the end of the cam remote from the slot therein to said arm.

3. A molding press having a relatively fixed head and a, relatively movable head, means for swinging the relatively movable head towards and away from the fixed head, a hinge pivot for the movable head, members having a pair of crossing cam slots for receiving the hinge pivot, and means for moving one of the cam slots with relation to the other during the opening and closing movement of the press so as to shift the position of the hinge pivot during the opening and closing movements of the press.

4. In a, press, a fixed mold, a movable mold, a frame supporting the fixed mold and having a guideway therein, a power operated toggle adapted to support and actuate the movable mold, a cam plate pivotally mounted on the frame, means for connecting the plate to said toggle, said plate having a cam slot in juxtaposition to the guideway, and a hinge pin carried by the movable mold and acted upon conjointly by the guideway and slot to effect a shiftable hinge for the movable mold.

5. A molding press having a relatively fixed head and a relatively movable head, means for swinging the relatively movable head towards and away from the fixed head, a frame, a cam plate pivotally mounted on the frame and operatively connected to said means, said frame having rectilinear guideway therein, and said plate having an irregular cam slot therein, a portion of said 5 slot being in registration with the guideway and substantially parallel thereto, and a hinge pin carried by the movable mold and acted upon conjointly by the guideway and slot to provide a shiftable h'inge for the movable mold.

JAMES W. BRUNDAGE.

REFERENCES CITED The following references are of record in the file of this patent:

- Number UNITED STATES PATENTS Name Date Iverson Jan. 29, 1935 Bos-twick Nov. 5, 1935 Bostwick Dec. 10, 1940 Iverson et a1 Jan. 19, 1943 Brundage Aug. 15, 1944 

